From Old Catalanmeu, from Latinmeus, meum, from Proto-Italic*meos. The feminine form was mia in Old Catalan, but this was extended to meva or meua by analogy with the masculine form. This happened because the -u was not understood as a masculine ending anymore, having been lost in nouns (unlike Spanish, Portuguese and Italian -o).

The weak possessive mon is also from Latinmeus, meum, but as an unstressed monosyllabic form.

And after the iron in the throat, the iron of the prison, and the poisonous seed of deportation inside the wounds, because no tree, or spike, or boy of ours is allowed to grow any longer, from the plain to the pier